package com.hll.api.controller.xinhua;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.hll.api.config.web.RespMessage;
import com.hll.api.exception.MyException;
import com.hll.api.service.impl.TulingServiceImpl;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;

import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.concurrent.CopyOnWriteArraySet;


/**
 * @author 何龙
 */
@ServerEndpoint("/websocket/{type}/{sid}")
@Component
@Slf4j
public class ChatSocket {

	//静态变量，用来记录当前在线连接数。应该把它设计成线程安全的。
	private static int onlineCount = 0;
	//concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。
	private static CopyOnWriteArraySet<ChatSocket> webSocketSet = new CopyOnWriteArraySet<>();

	//与某个客户端的连接会话，需要通过它来给客户端发送数据
	private Session session;

	//接收sid
	private String sid="";
	private static TulingServiceImpl service=new TulingServiceImpl();

	/**
	 * 连接建立成功调用的方法*/
	@OnOpen
	public void onOpen(Session session,@PathParam("sid") String sid,@PathParam("type") String type) {
		this.session = session;
		webSocketSet.add(this);     //加入set中
		addOnlineCount();           //在线数加1
		log.info("有新窗口开始监听:"+sid+",当前在线人数为" + getOnlineCount());
		this.sid=sid;
		try {
			RespMessage message1 = RespMessage.success("欢迎来到新华书店H5商城!");
			RespMessage message2 = RespMessage.success("有什么能为您服务的?");
			sendMessage(JSON.toJSONString(message1));
			sendMessage(JSON.toJSONString(message2));
		} catch (IOException e) {
			log.error("websocket IO异常");
		}
	}

	/**
	 * 连接关闭调用的方法
	 */
	@OnClose
	public void onClose() {
		webSocketSet.remove(this);  //从set中删除
		subOnlineCount();           //在线数减1
		log.info("有一连接关闭！当前在线人数为" + getOnlineCount());
	}


	/**
	 * 收到客户端消息后调用的方法
	 *
	 * @param message 客户端发送过来的消息*/
	@OnMessage
	public void onMessage(String message, Session session) throws IOException {
		log.info("收到来自窗口"+sid+"的信息:"+message);
		//群发消息
		for (ChatSocket item : webSocketSet) {
			try {
				JSONObject object = service.sendText(message);
				RespMessage success = RespMessage.success(object, null);
				item.sendMessage(JSON.toJSONString(success));
			} catch (IOException e) {
				e.printStackTrace();
			} catch (Exception e) {
				item.sendMessage("服务器异常");
			}
		}
	}

	/**
	 *
	 * @param session session
	 * @param error 错误
	 */
	@OnError
	public void onError(Session session, Throwable error) {
		log.error("发生错误");
		error.printStackTrace();
	}
	/**
	 * 实现服务器主动推送
	 */
	public void sendMessage(String message) throws IOException {
		this.session.getBasicRemote().sendText(message);
	}


	/**
	 * 群发自定义消息
	 * */
	public static void sendInfo(String message,@PathParam("sid") String sid) throws IOException {
		log.info("推送消息到窗口"+sid+"，推送内容:"+message);
		for (ChatSocket item : webSocketSet) {
			try {
				//这里可以设定只推送给这个sid的，为null则全部推送
				if(sid==null) {
					item.sendMessage(message);
				}else if(item.sid.equals(sid)){
					item.sendMessage(message);
				}
			} catch (IOException ignored) {
				throw new MyException("发送失败");
			}
		}
	}

	public static synchronized int getOnlineCount() {
		return onlineCount;
	}

	public static synchronized void addOnlineCount() {
		ChatSocket.onlineCount++;
	}

	public static synchronized void subOnlineCount() {
		ChatSocket.onlineCount--;
	}
}

